129 lines
3.6 KiB
C
129 lines
3.6 KiB
C
/* $NetBSD: pl030_rtc.c,v 1.5 2002/10/02 05:10:33 thorpej Exp $ */
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/*
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* Copyright (c) 2001 ARM Ltd
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the company may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/* Include header files */
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/time.h>
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#include <sys/device.h>
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#include <arm/cpufunc.h>
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#include <machine/intr.h>
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#include <evbarm/ifpga/ifpgavar.h>
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#include <evbarm/ifpga/ifpgamem.h>
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#include <evbarm/ifpga/ifpgareg.h>
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#define PL030_RTC_SIZE 0x14
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struct plrtc_softc {
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struct device sc_dev;
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bus_space_tag_t sc_iot;
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bus_space_handle_t sc_ioh;
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};
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static int plrtc_probe (struct device *, struct cfdata *, void *);
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static void plrtc_attach (struct device *, struct device *, void *);
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CFATTACH_DECL(plrtc, sizeof(struct plrtc_softc),
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plrtc_probe, plrtc_attach, NULL, NULL);
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/* Remember our handle, since it isn't passed in by inittodr and
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resettodr. */
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static struct plrtc_softc *plrtc_sc;
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static int timeset = 0;
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static int
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plrtc_probe(struct device *parent, struct cfdata *cf, void *aux)
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{
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return 1;
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}
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static void
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plrtc_attach(struct device *parent, struct device *self, void *aux)
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{
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struct ifpga_attach_args *ifa = aux;
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struct plrtc_softc *sc = (struct plrtc_softc *)self;
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sc->sc_iot = ifa->ifa_iot;
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if (bus_space_map(ifa->ifa_iot, ifa->ifa_addr, PL030_RTC_SIZE, 0,
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&sc->sc_ioh)) {
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printf("%s: unable to map device\n", sc->sc_dev.dv_xname);
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return;
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}
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plrtc_sc = sc;
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printf("\n");
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}
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void
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inittodr(time_t base)
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{
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time_t rtc_time;
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struct plrtc_softc *sc = plrtc_sc;
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if (sc == NULL)
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panic("RTC not attached");
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/* Default to the suggested time, but replace that with one from the
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RTC if it seems more sensible. */
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rtc_time = bus_space_read_4(sc->sc_iot, sc->sc_ioh, IFPGA_RTC_DR);
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time.tv_usec = 0;
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time.tv_sec = rtc_time;
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timeset = 1;
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if (base > rtc_time) {
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printf("inittodr: rtc value suspect, ignoring it.\n");
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time.tv_usec = 0;
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time.tv_sec = base;
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return;
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}
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}
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void
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resettodr()
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{
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struct plrtc_softc *sc = plrtc_sc;
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/* The time hasn't been set yet, so avoid writing a dubious value
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to the RTC. */
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if (!timeset)
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return;
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bus_space_write_4(sc->sc_iot, sc->sc_ioh, IFPGA_RTC_LR, time.tv_sec);
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}
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